SECTION - VII

TECHNICAL SPECIFICATIONS

TECHNICAL SPECIFICATIONSSECTION 1 - GENERAL REQUIREMENTS

1-01 MATERIALS

All materials shall be of the highest grade, free from defects and imperfections, of recent manufacture and unused, and of the classification and grades designated, conforming to the requirements of the latest issue of the appropriate specifications cited herein. All materials, supplies, and articles forming part of major equipment and not fabricated by the manufacturer of the equipment shall be the products of the recognized reputable manufacturers.

1-02 WORKMANSHIP

Workmanship and general finish shall be of the highest grade, in accordance with the requirements specified herein, and the best modern standard practice.

1-03 EQUIPMENT

a) For ratings and characteristics of manufactured equipment, Equipment Schedule as appended to Technical Provisions shall be followed.

b) All equipment shall be manufactured by companies which have had at least ten years previous experience in the design and manufacture of equipment of comparable type, capacity and operating conditions unless otherwise approved by the Engineer.

c) Where the requirement of this Clause make any equipment proprietary or non-obtainable, the Engineer reserves the right to waive any portion or portions of it as required to obtain the intent of the technical specifications (s).

d) When a manufacturer's product is specified by name, or equivalent, it shall be in the sole judgment of the Engineer as to acceptability of any product which is offered as equal to that specified.

e) Where two or more units of the same class of equipment are furnished, product of the same manufacturers shall be used: component parts of entire system need not be product of same manufacturer.

1-04 CHASSES AND OPENINGS

The Contractor shall provide shop drawings, templates or details for chases and openings to be left in concrete walls, concrete partitions, floor or roof slabs to accommodate work under HVAC scope of works.

1-05 PROTECTION

The Contractor shall keep pipe, duct and other openings closed to prevent entry of foreign matter. All fixtures, equipment and apparatus shall be covered and protected against dirt, water, chemical or mechanical damage, before and during the construction period. All fixtures, apparatus, or equipment damaged including damaged shop coats of paint shall be restored to original conditions prior to Commissioning and also again prior to Final Acceptance. All bright finished shafts bearings housings and similar items shall be protected until in service: no rust will be permitted.

1-06 CUTTING, PATCHING AND REPAIRING

(EXCEPT CUTTING IN CONCRETE).

Required for proper installation and completion of HVAC works, including masonry work, carpentry work, painting and re-painting shall be performed by skilled craftsmen in respective trades, at expense of the Contractor. Construction shall be cut only after obtaining written permission from the Engineer.

1-07 LINES AND LEVELS

The Contractor shall check dimensions at the building site and establish lines and levels for work specified in Specifications. The Contractor shall check with work of other trades to ensure proper clearance of piping, ductwork, conduit and other items.

1-08 MACHINERY GUARDS

All moving parts of machinery are to be protected by strong guards to adequately protect all personnel working on or in the vicinity of equipment.

Wherever possible, moving parts should be protected by guards supplied by the equipment manufacturer. All guards must be strongly attached to equipment and should be designed for easy removal for access, servicing, adjustment and maintenance.

1-09 TOOLS

The Contractor shall supply in a tool box, full sets of tools suitable for maintenance of all components of the plant furnished by him including the electrical equipment, for use by the Employer after completion of Maintenance Period. List of Tools shall be subject to approval by the Engineer.

1-10 OIL AND GREASES

The oils and greases shall be supplied in sealed containers. These shall be of suitable quality sufficient for the initial charge plus hundred percent (100%) extra. The quantity, grade of oil and greases and their manufacturer shall be approved by the Engineer. The extra oils and greases shall be reserved for use by the Employer after completion of Defects Liability Period.

1-11 SPARE PARTS

The spare parts (if required) for HVAC System shall be duplicates of the original parts furnished and interchangeable therewith.

1-12 ACOUSTIC TREATMENT

The noise criteria for different areas stated in Special Provisions is to be obtained.

Sound measurements will be made at approximately 1.50 meters above floor level in the occupied area served and not more than 1.50 meters from the grills, diffusers or other air devices being tested. Instruments for sound measurement shall be provided by the Contractor.

Provision is to be made to minimize noise and vibration. However, different manufacturers equipment have varying sound and vibration characteristics and it is, therefore, the responsibility of the Contractor to ensure that the requirements in these specifications are fully met by the equipment he is offering. If the Contractor has any requirements for additional vibration or sound isolation, these must be incorporated into the price quoted.

All equipment installed should not be audible inside the occupied areas and the Contractor must ensure that all equipment he is offering is quiet and have satisfactory sound levels. Where silencers are required, these must be incorporated into the price quoted.

1-13ACCESS PANELS

The Contractor shall mark locations of, and give sizes of, access panels required in false ceiling and wall paneling for adjustment and maintenance of HVAC Equipment, such as Dampers, Fire Dampers, valves, ceiling-hung equipment, etc. This information shall be provided to the Engineer before commencement of false ceiling work by the concerned persons.

1-14SEALING OF OPENINGS

The contractor shall seal all openings in external walls and roof where HVAC ducts/pipes penetrate in external membrane. The sealing shall be air tight to prevent penetration of outside air and water into building. The method and materials for sealing shall be subject to Engineer's approval.

Section 2Detailed Specifications

(HVAC Equipment)

2.1GENERAL2.1.1All equipment shall be of such overall dimensions, operating weights service area requirements and configuration that it can be located where shown on the plans without any adverse effect on its performance and clearance requirements. Electrical input KW shall not exceed KW listed in Schedules. Any change in other trades work, anticipated by offering alternate equipment shall be estimated by the Contractor and its cost shall be included in the quoted price for HVAC works.

2.1.2All equipment supplied under this section shall be brand new, factory manufactured and factory assembled and complete in all respects. The type, characteristics, capacity rating, component sections of all equipment shall be as scheduled in the drawings.

2.1.3All equipment furnished by the Contractor shall include vibration isolation mounting, pads, anchors bolts frames or any other mounting or supporting accessories.

2.1.4All power driven equipment shall include motor drives, and motor foundation bases and accessories.

2.2STEAM FIRED ABSORPTION WATER CHILLER

2.2.1Owner supplied equipment2.3COOLING TOWERS2.3.1GeneralCooling towers shall be rectangular, cross flow, forced draft, multi cell type and shall be constructed generally of weather proof and corrosion resistant. Cooling towers shall be factory assembled or site assembled under supervision by manufacturers representative. The offered cooling towers must be CTI certified.

The cooling tower shall be complete with fan, water distributing system, infill, tower basin, sump, drift eliminators, drains and fittings. The size and capacity of the tower shall be suitable for the location and space indicated on the drawings with ample clearances for installation, operation and maintenance. The heat rejection capacities shall be as scheduled.

Cooling towers installed external to the building shall be adequately designed to withstand the maximum stress imposed by broadside winds equivalent to 1.5 kpa of projected surface.

2.3.2StructureCooling towers shall be of fiberglass reinforced polyester or PVC construction manufactured entirely from U.V. stabilized non-corrosive materials with all fastenings of steel. Casing shall be fitted with access doors to reach all internal parts, such as sumps, water distribution system, without the removal of the infill.

Unit support legs, framing and structural members shall be formed from heavy gauge steel sheet or pipe sections, hot dip galvanized after fabrication. It shall be suitable for the installation of vibration isolators where specified, with minimum addition of auxiliary structural support.

2.3.3Cold Water BasinThe cold water basin shall be complete with floor sloped to an integral sump fitted with a removable screened suction outlet connection, balancing outlet connection, overflow, drain valve and float controlled make-up connection.

2.3.4Water Distribution SystemCooling towers shall be provided with a water distribution system designed so that a water flow of 140 percent of the specified capacity will not cause overflow or splashing.

Nozzles and splash plates shall be manufactured from polyacetal, brass, aluminium alloy or other corrosion resistant materials. Nozzles shall be of the low loss replaceable type.

Tower infill shall be of corrugated honeycomb packs which shall be removable or otherwise made accessible for cleaning. All PVC in fills shall be ultra-violet ray treated. Multiple layer of fills shall be separately reinforced and supported to ensure stability in operation.

2.3.5Drift EliminatorsThe tower shall be fitted with stainless steel drift eliminators specially designed to ensure water loss due to drift is not more than 0.02% of the circulating water quantity.

2.3.6Fans Motor SetFans shall be axial type, of slow speed belt driven, quiet in operation and statically balanced.

Fan motors shall be totally enclosed fan cooled weather proof type suitable for 400 volt/3 phase/50 Hz power supply and sized to be non-overloading at all operating conditions and comply in all respects with the Motors clause in the section on Electrical Works of this specification. The fan motors shall have F Class IP 55 insulation suitable for high ambient.

Belt drives shall be weather-proof and shall have adequate means for adjusting belt tension. Weather-proof belt covers shall be provided to protect V-belts which shall be of the fabric impregnated type.

All motors/fan rotors shall be statically and dynamically balanced to International Standard ISO-1940 Balance Quality of Rotating Rigid Bodies and shall be free from vibration at all operating speeds and during starting and stopping cycles.

2.3.7Access LaddersAn access ladder constructed of hot dipped galvanized iron shall be provided for gaining access to the water distributing system and fans. In multiple cell towers where single point access is provided, a safety rail made of hot dipped galvanized iron shall be provided around the tower top periphery.

2.3.8Noise LevelsCooling towers shall be guaranteed to operate at low noise and shall not exceed 67 dBA measured 2m from air intake face and 75 dBA at 450 and 1.5m distance away from fan.

2.3.9Quality Assurance TestsTo ensure quality, guaranteed efficiency and performance in compliance with the specified conditions, at least one unit of each model of the cooling tower shall be fully tested.

The tests shall be conducted at the manufacturers factory workshop where proper testing facilities are available and the tests shall be certified by the manufacturer. After assembly, the cooling tower shall be tested on the following:

(a) Temperature

Leaving water temperatures from the tower shall be checked at design condition in accordance to the approved performance curves.

(b) Sound Pressure LevelsSound tests shall be carried out under controlled conditions to verify sound pressure levels with all fans operating at high speed and full water flow.

2.3.10Approved Makes Marley

Nihon Spindle

Mesan

Shinwa

Kukan

2.3.11Approved Countries of Origin Malaysia

Hong Kong

China

Thailand

2.4CENTRIFUGAL PUMPSPumps for water application shall be end-suction centrifugal type with casings designed for working pressure at least one and a half times the total pressure on the casing. Flange connections shall correspond to casing working pressure.

The Contractor shall submit the pump head calculations in accordance with the piping layout finalized at site considering site conditions. Certified test curves of pump performance shall be furnished for approval showing horsepower, total dynamic head and efficiency versus water flow rate.

Each pump shall be driven by a constant speed motor through a flexible coupling. Motor horsepower shall be selected in a way that the motor shall not be overloaded at any point on the characteristic curve when operating at design speed.

Each pump shall be guaranteed to circulate not less than the quantity of water against the required circulating head when operating continuously, without overheating the motor or bearings, etc. When more than one pump is required to operate in parallel, the pumps performance curves when operating in parallel shall be provided to show that required flow at the specified head will be obtained. Pumps shall not transmit vibration to the building and shall operate without producing noise, audible anywhere in the building, outside the space in which the pumps are installed. Flexible connections shall be provided at pump suction and discharge.

Chilled water, hot water and condenser water pumps shall have bronze impeller, stainless steel shaft and mechanical seals.

Pump and motor shall be mounted on common base frame and shall have been factory aligned.

Outdoor installed pumps shall be provided with rain protected canopy to avoid the entry of rain water and to avoid the weather effects.

The Contractor shall be required to commission the pump as per manufacturers recommendations. The pump test runs shall be carried out

by the contractor and comparison with operational curves submitted to the consultants.

The approved makes are KSB, Grundfoss or approved equal from Pakistan/China. The Tenderer shall supply the following information for each pump.

Make and model No.________________________________

Flow rate, (M /Hr)._______________________________

Discharge head (M) _________________________________

Motor Power (kW) ___________________________________________

Type of motor and pump Manufacturer performance guarantee certificate & compliance certificate.2.5AIR SEPARATOR

The Contractor shall supply and install air separator for chilled/hot water system as shown on the drawings. The air separator shall be of cylindrical design, vertical, with inlet, outlet, drain and expansion tank connection. Tank shall be design fabricated, tested, inspected for 125 Psi maximum water operating pressure. The operating temperature range is 6.7 C (44 F) to 60 C (140 F). The approved makes are IME, Grand or Steam Master from Pakistan.2.6EXPANSION TANK

The expansion tank shall be horizontal type for ceiling suspension, designed, fabricated, tested, inspected and stamped as per ASME Code for Unfired Pressure Vessels. Design pressure rating shall be 8.8 Bar (125 Psi). The operating temperature range is 6.7 C (44 F) to 60 C (140 F).The tank shall be fitted with refrigeration type sight glass, sight glass valves, air release fitting in bottom of tank incorporating air tube, hose and bottom drain. The approved makes are IME, Grand or Steam Master from Pakistan.

2.7CHEMICALS & CHEMICAL FEEDERS2.7.1Chilled Water SystemThe contractor shall provide gravity by-pass type chemical feeder for chilled water system. Feeders shall be installed as shown on Drawings. Gravity Bypass Feeder shall be of 5 US gallon capacity cast iron construction (or MS construction with inside epoxy lining), complete with bottom drain tapping and couplings.

Sufficient chemicals for Preliminary Tests, Pre-start & Commissioning Tests and for one year of plant operation after commissioning shall be provided.

2.7.2Condenser Water SystemThe Contractor shall provide continuous drip injection pump type chemical feeder for condenser water system. The chemical feeder make shall be as per makes list given in appendices.Sufficient chemicals for Preliminary Tests, Pre-start & Commissioning Tests and for one year of plant operation after commissioning shall be provided.

The approve makes for chemicals are Dew Ameroids, GE Betz ( USA/ Europe) or approved equal.

2.8STEAM CONDENSATE RECEIVING TANK

The steam condensate receiving tank shall be made of steel sheet (M.S) of size given in schedules. The tank shall be suitable for working pressure of 10 Bar and shall be tested at 15 Bar pressure. The minimum thickness of steel sheet shall be 10 mm. Tank shall be furnished with gauge glass, inlet/outlet connections, skid mounting, drain point, automatic air vent and electrical level control sensor. Tank shall be externally painted with anti corrosive paint.

The approved manufacturers for tank are Descon, DDFC, IME, Steam Masters or approved equal from Pakistan.

2.9PIPING, HANGERS AND SUPPORTS2.9.1All piping shall be properly supported or suspended on stands, clamps, hangers, etc. of approved design. Supports shall be designed to permit free expansion and construction while minimizing vibration. Pipes shall be anchored, while minimizing vibration. Pipes shall be anchored, where shown or where directed by means of steel clamps securely fastened to the pipe and rigidly attached to the building construction.

2.9.2Screw threads shall be cut clean and true, screw joints made tight without caulking and without red or white lead, No bushing shall be used to change pipe size. Reductions to be made with eccentric reducers or eccentric fittings. All pipes 2 inches and less shall be reamed out after cutting to remove all burrs.

2.9.3The drawings indicate generally the size and location of piping as designed for space conditions, ceiling heights, etc. and may not be changed until coordinated with other Contractors. Pipe work shall conform fully to the following requirements.

2.9.4Piping shall be properly graded to secure easy circulation and prevent noise and water hammer. As much pitch as space conditions permit, to point where vent relief, drip and drain connections are provided. Capped dirt pockets at all riser heels, low points and other places where dirt and state may accumulate. Proper provision for expansion and Contraction in all portions of pipe work to prevent under strains on piping or apparatus connected therewith. Double swing at riser transfer wherever possible to take up expansion. Expansion joints and loops where indicated.

2.9.5Approved screw unions, with steel or bronze bodies and ground brass taper or spherical joints, shall be installed at traps, instruments, etc. and wherever else direction to permit easy connection and disconnection.

2.9.6All pipe work shall be so arranged and put together as to prevent undue strains or leaks caused by expansion and Contraction. Riser branches and other offsets made up with 4 elbow swings wherever possible. Riser branches arranged to take up motion of risers and mains.

2.9.7To meet job conditions, water supply and return mains shall be set up and down where directed. In any such case, provide drain cocks at low points and vent traps at high points.

2.9.8Connection to water supply and return mains shall be made at sides, vertically or at 45 degrees, as shown or directed (generally at 45 degrees). Vent connections at all high points, connected to expansion tank as shown or directed.

2.9.9Alterations - If after plant is in operation, any coils do not circulate quickly and noiselessly (due to trapped or airbound connections), the Contractor shall make proper alterations in these defective connections. If connections are concealed in furring, floors or ceilings, he shall bear all expense of tearing up and refinishing construction and finish.

2.9.10All piping passing through floor construction shall have No. 20 U.S. gauge galvanized irons sleeves the full depth of the floor construction. Any sleeves in wet areas, such as equipment rooms, shall extend 1 inch thick floor, and space between pipe and sleeve shall be caulked water tight.

2.9.11All visible piping passing through finished floors and ceilings shall be provided with escutcheons. Escutcheons shall be bell shaped, with plated finish and shall be fastened to pipe.

2.9.12Sleeves for exposed horizontal pipes passing through partitions shall be galvanized steel pipe with heavy spun metal, and set-screwed to the pipe on each side of partition.

2.9.13All sleeves shall be of sufficient size to include pipe covering.

2.9.14All sleeves shall be furnished, located and set up by the Contractor and he shall be responsible for the accuracy of their location when concrete is poured.

2.9.15Piping or ductwork passing through water proof construction will be counter flashed.

2.9.16Any piping run underground shall be painted with two heavy coats of asphalt paint.

____________________________________________________________________

Service

Material Type

Weight

____________________________________________________________________

Chilled/Hot water

Steel

Black

Schedule 40

Condenser water

Steel

Black

Schedule 40

Steam & Condensate

Steel

Black

Schedule 40

Drains (Branches)

G.I.

GalvanizedMedium

____________________________________________________________________

2.9.17Provide suitable and substantial hangers and supports for all horizontal piping. Piping shall be carried by pipe hangers supported from concrete inserts. In general, supports for pipes shall be not more than 10 feet apart for 4 inches and larger pipes, and not more than 8 feet apart for 3 inches and smaller according to the conditions of the job.

2.9.18The Contractor shall furnish and set all concrete inserts and shall be responsible for such inserts being in place when concrete is poured. Inserts shall be of approved quality and shall be constructed of malleable iron and shall have space for rods of all sizes. On all inserts for pipes 3 inches reinforcing rods 5/8 inch diameter through the slot provided for this purpose, and shall be responsible for its being in place when concrete is poured.

2.9.19All concrete inserts shall be placed in forms, in ample time to permit the Contractor for general construction to perform his work on scheduled time.

2.9.20All vertical piping shall be supported by heavy pipe clamps resting on the building construction.

2.9.21No piping shall be hung from other piping. Piping shall be supported from the building structure. Hangers shall be of heavy construction, suitable for the size of pipe to be supported. All materials, except rollers, shall be wrought malleable iron. Hangers for pipe upto and including 5 inch size, shall be swivel ring, split ring or adjustable clevis type. Hangers for larger pipes shall consist of two rods and cross rod with cast iron pipe roll.

2.9.22Hangers for insulated piping shall support the pipe without piercing the insulation. Cold, insulation pipes shall be provided with a section of work on of each hanger insulation. hot, insulated pipes shall be provided with insulation saddles of each hanger. Saddles shall be spot-welded to pipe.

2.9.23The Contractor shall provide manufacturers catalogues and literature as applicable.

2.10.

THERMAL INSULATION2.10.1No insulation shall be applied to any ductwork, or to any surface, until all foreign matter has been removed from the surfaces to be installed. All insulation shall be applied in a manner consistent with good practice and methods.

2.10.2Insulation shall be continuous through floors, walls, partitions, etc. except with otherwise indicated or specified. Where space will not permit application of insulation in wall or slab chase, the chase will be packed full or 85% magnesia mineral wool, asbestos rope, or fiberglass and protected with cover plates, as approved by the Engineer/Consultants.

2.10.3All exposed ducting, expansion tank, air separator, chilled water pumps in plant room areas except as specified otherwise shall be insulated with 2 inch (50 mm) thick, 1.5 lbs/cu feet (24 Kg/m) density, fiber glass, factory applied FRK facing. The insulation shall have a thermal conductivity not greater than 0.25 BTU-in/hr-Sq.ft-F (.036 w/m-K). All joints shall be sealed with 3 inch (80 mm) wide aluminum foil faced tape. The insulation shall be protected with 8 OZ (226.8 g) white canvas cloth.

2.10.4 All Concealed ducts, except as specified otherwise shall be insulated with one inch thick 0.75 lbs/cu feet (12 Kg/m) density, glass fiber Factory applied (FRK) facing. The thermal conductivity shall not be greater than 0.28 BTU-in/hr-Sq.ft-F (.04 w/M-K). The insulation shall be in accordance with the manufacturers recommendation. All joints should be sealed with 3 inch FRK tape.

2.10.5External and weather exposed insulated ducting shall be insulated as specified and then protected with a jacket of 45 lbs roofing felt, all joints sealed with hot bitumen PBS PB4 or approved equal. The jacket shall be further mechanically secured to the duct with 1/4 wide soft aluminum bends, generally spaced at 18 in indigenous coarse cloth or continuous G.I sheet of U.S gauge-26.

2.10.6 The fiber glass duct & pipe insulation shall be of fiber glass Kimmco, Owen-Corning or Affico manufacture.

2.10.7 Insulation for chilled/hot water pumps shall be glass fiber Factory applied (FRK) facing, suitably braded removable boxes of 24 gauge G.I. sheet.

2.10.8Insulation for chillers hot & cold side shall be as per recommendation of chillers manufacturer.

2.10.9

Pipe Insulation2.10.10All insulating materials required for piping, mechanical equipment and ductwork etc. shall be furnished and installed under this Contract. The execution of the work shall be by the insulation manufacturer, in strict accordance with the best practice of the trade and the intent of this specification.

2.10.11Pipes shall be insulated and covered as called for in the schedule of insulation.

2.10.12Piping which is exposed to weather, or called to be weather proof, shall be covered, in addition to insulation and finishes, with 45 Lbs roofing felt, lapped three inches on all joints, using adhesive specified above, and soft aluminum bands 12 inches apart and then clad with U.S gauge 26 G.I sheet.

2.10.13All vapour barriers shall be completely sealed against moisture penetration.

2.10.14Indigenous asphalt impregnated craft paper, canvas and roofing felt of approved quality are to be used.

2.10.15Chilled / Hot Water piping shall be insulated with sectional glass fiber faced with FRK. The thickness shall be as specified in previous section. All glass fiber shall have a density at least 4 lbs/ft (64 Kg/m). Steam/condensate drain pipes of steam shall be insulated with rock wool insulation having density 6.25 lbs/ft (100 Kg/m). The insulation shall be protected with the approved quality of the canvas 8 oz. The approved makes are Owens Corning, Affico, Kimmco or approved equal.

2.10.16 Cooling Coil Condensate Pipe Insulation shall be 1/8" (6 mm) thick pipe insulation vinyl aluminum foam with aluminum foil self adhesive tape 3" (80 mm) wide.

2.10.17The thickness of the insulation shall be as under:

All pipes up to 3 Dia (80 mm) = 1 thick (25 mm)All pipes 4 (100mm) & above = 2 thick (50 mm)2.11VALVES AND FITTINGS2.11.1Hand valves and check valves shall be furnished and installed as shown on the drawings, required or directed.

2.11.2All valves for throttling service in chiller and as so noted on the drawings, shall be of the globe type.

2.11.3Check valves in horizontal position shall be 150 deg swing, check valves in vertical position and pump discharges (if not used MPV) shall be balanced check valves of the low pressure drop type.

2.11.4Provide all necessary manual or automatic vent valves, drain valves, in equipment rooms more than 6 feet above floor.

2.11.5Furnish and install all other hand valves, check valves, cock etc. as required for the complete and proper valves of the entire installation as defined herein.

2.11.6Chilled water piping connections to air conditioning units shall include all necessary gate valves, air vent valves, drain connections, lock shield valves and the automatic valves arranged as detailed on the drawings. Lubricated plug cocks may be used in place of lock shield valves 3 inches (80mm) and up.

2.11.7Inverted ball float traps shall be used for venting water mains at all high points and wherever else required, or as directed. Traps shall be 3/4 inch (20 mm) and of approved quality.

2.11.8Drain cocks, with threaded ends for hose connection, shall be provided for any low points in the water and return main where directed.

2.11.9Compression type, key-operated, air cocks shall be furnished and installed where shown and where required for venting. Cocks shall be 1/4 inch (6 mm ) in size and shall be all bronze construction. At least two dozen keys shall be delivered to the owners representative for operating these cocks.

2.11.10 All cast iron body valves shall have renewable bronze seat rings and bronze spindles. They shall have the self packing feature so that they can be packed while open and under pressure.

2.11.11 Steam traps shall be mechanical type (bucket / float type) with rise able float & mechanical linkage to maintain desired level of condensate. The traps shall be suitable to discharge condensate & non condensable gases with negligible loss of steam. These shall be forged body type and shall stand upto 6 MPa pressure rating. The approved makes are Spirax Sarco (UK) or approved equal.

2.11.12Valves shall be of Tozen/Econosto/Kitz/ KSB & Hatersley or approved equal from imported origin.

2.11.13Furnish and connect to all valves, except valves at equipment, brass tags, polished or lacquered with stamped lettering or numbers filled in with black paint. Also furnish a schedule of all valve tags, framed in a polished hardwood frame and covered with plate glass.

2.11.14All strainers in water lines shall be y-pattern, set in a horizontal (or vertical downward) run of the pipe. Where this is not feasible, strainers may be of enlarged cross-section flat type. In all cases, strainers shall be so arranged as not to trap pipes and to facilitates disconnection and opening up for cleaning.

2.11.15All strainers shall have cast iron or bronze bodies of ample strength for the pressure to which they shall be subjected, removable cylindrical or conical screens of nickel, copper or brass, and suitable flanges or tapings to connect with piping they serve. They shall be of such design as to allow blowing out of accumulated dirt, and to facilitate removal and replacement of a strainer screen, without disconnections of the main piping.

2.11.16Standard features for pipe fittings are given in the table below:

____________________________________________________________________

SERVICE

SIZE

MATERIALTYPE

WEIGHT

____________________________________________________________________

Chilled/Hot WaterUpto 2 in.Cast ironScrewed125 Lbs

3 in & upSteel

WeldingStandard

Condenser WaterUpto 2 in.Cast ironScrewed125 Lbs

3 in & upSteel

WeldingStandard

Steam/CondensateUpto 2 in.Cast ironScrewed125 Lbs

3 in & upSteel

WeldingStandard

Drains (Steel Pipe)All

Cast ironGalvanizedStandard

____________________________________________________________________

2.11.17All steel welding elbows shall be of the long radius type, except where conditions do not permit.

2.11.18The Contractor has the option of welding steel pipe 2 inches in size or larger. Where welding is used, fitting shall be Tube Turn or as approved. Weld-0-lets may be used where fittings of standard sizes are not available, and where authorized. No other type of welded joint is acceptable. All hob welding shall be by the electric and welding process in accordance with the following:

(a)All joints 45 degree level type. Pipe mill-beveled or machine-beveled by the Contractor.

(b)All scale and oxide removed with hammer, chisel or tile and bevel left smooth and clean.

(c)Pipe lengths lined up straight with abutting pipe ends concrete.

(d)Both conductors from welding machine shall be extended to location at which work is performed and shall be taped or held together so as to prevent induced currents in structural steel, in piping or in other metals within this building. The ground lead shall be connected to lengths of pipe with suitable clamp in such manner that welding current will not flow through joints in pipe, structural steel of building or steel pipe supports.

(e)Weld metal must be thoroughly fused with base metal at all sections, Welds shall be of sound metal, free from laps, slag inclusions or other defects.

(f)All welders shall be fully qualified and approved for such work.

2.12ELECTRICAL WORKS2.12.1The Contractor shall be responsible for complete electric wiring and earthing of the plant equipment and controls. The Employer shall only provide 3 phase and neutral, 4 wire supply point(s) at locations shown on the drawings and detailed elsewhere in the documents.

2.12.2The electric wiring shall be carried out in conduit, sheet metal channel, cable tray, or G.I. piping, all wiring buried in the floor to be in G.I. piping. The wire sizes shall be selected for satisfactory operation at least 110 deg F. of ambient temperature. The wiring and earthing shall be carried out according to the requirements of any local code and Pakistan PWD Schedule.

2.12.3The terminal connections for motors, and where required, for starters, shall be made in flexible conduit. The terminal wiring for 230 volts, 1 phase fractional horse power motors, such as fan-coil unit fan motors and their starter control switches, can be exposed PVC insulation and sheathed wiring, connections protected within the terminal box so that no line lead is exposed.

2.12.4The wiring for electric/electronic automatic controls shall preferably be with single conductor wire which may be PVC insulated with conduit, exposed shielded or exposed PVC insulated and sheathed wiring in accordance with the recommendations of the control manufacturer. The live connections shall be protected by the cover plates to avoid any hazard. The wiring outside the plant rooms or fan coil unit enclosures must be in conduit to avoid any mechanical damage.

2.12.5All control boards shall be factory fabricated.

2.12.6On each control board, incoming supply shall have air circuit breaker if the rating required is 200 A or more, and moulded case circuit breaker in case of lower rating. Appropriate short circuit under voltage and thermal overload protection shall be provided. All breakers shall be of continuous type. The disconnect switch may be rotary type for 100 Amps, and lower rating. The fuses to be of the HRC time lag link type according to BS 88: 1952 and ASTA-20 certified. Two sets of replacement HRC fuses shall be supplied as spare for each disconnect switch. The Consultant may allow the use of high repute capacity, heavy continuous duty type, moulded case circuit breakers.

2.12.7Single phasing preventer relay shall be provided for each 3 phase circuit of 1 HPand above rating. The Contractor shall supply and install necessary electric control boards, circuit breakers, disconnect switches, fuses, MCBs, earthing, etc. to complete the work. It would be required where possible, to mount all the circuit breakers, disconnect switches, fuses, starters, switches, relays, and controls in one machine room on the control board for ease of operation.

2.12.8The control boards shall be of design and construction to provide easy access to all internal components for servicing and replacement. The large size boards to have multi-panel type construction. The board shall have hinged access doors at the front, swing not exceeding 10, and of design that all work, servicing, maintenance, replacement, additions, and alternations can be carried out from the front without requiring access from back. The back panel shall be bolted and easily removable. The board to have protected busbars. The board to have indicating name plates for all items. Adequate front face illumination lights and internal lights shall be provided, if required. All circuits shall be numbered and tags fixed with the wires for identification. The main control board in the central plant room to have one 30 Ammps, 3 phase service outlet with disconnect switch, fuses and 4 pole quick disconnect coupling, and two 15 Amps. and one amp 3 pin, single phase, service outlets with on-off switches and fuses. The control boards in the air handling unit rooms, plant rooms, etc. shall have one 15 Amp 3 pin single phase service outlet with on-off switch and fuse. Six sets of complete details of wiring diagrams fuse. Six sets of complete details of wiring diagrams for each board shall be supplied to the Employer and one set to be kept in a pocket in the respective board.

2.12.9The Contractor shall be responsible for the complete power and control electric wiring of the air conditioning plants as required for the air conditioning system.

2.12.10For remotely located equipment, a power point shall be supplied near each unit or where indicated on the drawings, and wiring onwards shall be the responsibility of the air conditioning Contractor. This will also include all wiring from secondary panels to central control panel.

2.12.11The electrification work shall be carried out by a licensed workman, authorized to undertake such work under the provision of Pakistan Electricity Act and Rules.

2.12.12All control boards shall be as fabricated by AEG/PEL/SIEMENS/JIE or approved equal. Wires and cables shall be as manufactured by Pakistan Cables Limited, A.G.E Industries Limited or approved equal.

2.12.13The Contractor shall submit schematic electric wiring diagram, manufacturers construction drawings, technical literature for all components proposed to be used, to Consultants for checking and approval before the fabrication of boards is commenced. The work will be carried out only in accordance with the approved drawings and components.

2.12.14APPROVED MAKES:

Components:

i) Terasaki (Japan)

ii) Mitsubishi (Japan)

iii) Telemechanique (France)

iv) Siemens (Germany)

v) M&G (France)

Distribution panels:

i) Electromech

ii) Mazcorpiii) A To Z

iv) Electrech

v) ECS

vi) South Asian

2.13AUTOMATIC TEMPERATURE CONTROL SYSTEM2.13.1 TYPE

Temperature and automatic Control system shall be Direct Digital Control (DDC) with microprocessor based local control panels, without networking between local panels.

2.13.2 SCOPE

The Contractor shall furnish and install complete control system as Specified hereinafter. Control system shall include all components required for control system as described hereinafter and/or as shown on HVAC drawings. All necessary sensors, controllers, actuators, control valves, control power supplies, voltage stabilizers, line conditioners, thermostats, humidistats, flow switches damper motors, relays, safety devices, switches, linkages, control transformers, interconnecting wiring and conduit to form a complete system shall be supplied and fitted by the Contractor. The entire temperature and automatic control system shall be supplied by one manufacturer and shall bear nameplate of the manufacturer. It shall be commissioned by local representative of control system manufacturer.

Before starting the installation work, the control system schematic diagrams, made by the manufacturers or their qualified representative, shall be submitted to the Engineer for approval.

Calibrations and adjustments shall be made by a qualified representative of the manufacturer of controls to the approval of the Engineer. The control valves and thermometers shall be suitable for operating pressure and temperature. Valve shall have been tested at atleast 1-1/2 times rated working pressure. The insertion sensors in piping shall be provided with separable copper wells and all duct sensors shall be provided with duct mounting brackets, protection shields etc.

The supplier of control system should also study Section 18 of these Specifications to know the requirements of interface with electrical works of HVAC system.

2.13.3SIGNS

All thermostats, switches and control devices shall be clearly labeled with identifying nameplates as specified in Section 18, Electrical Equipment and Controls.

2.13.4FRAMED CONTROL DIAGRAMS

Approved Control Schematic diagrams showing the complete layout of each control system, including equipment and control function shall be furnished framed under glass or in approved laminated plastic for posting at approved locations.

2.13.5 CONTROL TRANSFORMERS

Dry-type transformers for controls of air conditioning system shall be generally indoor type. The transformer shall be rated to carry the maximum possible load continuously, and shall be designed for the particular system for which it is intended.

2.13.6CONTROL POWER SUPPLY

Power to control power distribution panel shall be supplied from main HVAC distribution panel MCC-1. Power supply to all other control panels shall be from this control distribution panel.

2.13.7THERMOSTATS

Thermostats where specified and/or shown on the Drawings shall be cooling-heating type with changeover through DDC controls. Thermostats shall be low voltage and shall control (+/-1 Deg C) of temperature setting at the sensor location, unless otherwise specified. Thermostats shall be adjustable to temperature range and differential and shall be suitable for inside design temperature. Variations from above in the specifications of the standard thermostat forming integral part of the factory assembled equipment may be accepted with the approval of the Engineer. All room thermostat sensors shall be mounted at wall 1.5 m above floor unless otherwise indicated at locations as directed by the Engineer.

Thermostats shall be modulating type for AHUs, unless otherwise specified or shown. Room thermostats other than installed in operating theatres shall have locking cover, with removable knob for setting, calibrated in degrees centigrade. Setting or re- setting shall not be possible without removing locking cover. Thermostats shall include temperature indicator.

Thermostats for fan coil units shall be integral with 3-speed fan switch, heating, cooling, wall mounted type, with on-off and heating-cooling switches. It should indicate room temperature and calibrations shall be in degrees Fahrenheit.

2.13.8TEMPERATURE CONTROL METHOD

The manufacturer of control system shall submit through the Contractor suitable temperature control method and sequence of operation for Engineer's approval.

2.13.9FLOW SWITCHES

Flow switches shall be packless, vapour-type construction, with all vetted parts made of brass and designed for mounting in tees. Device shall be capable of being mounted in pipe tees 1 inch and larger. Paddle shall be provided with removable segments to accommodate required pipe size and flow. Switching shall be single pole, double throw time delay action type, with a rating of 5 amps. full load with 220 volts AC.

2.13.10PRESSURE DIFFERENTIAL SWITCHES

Pressure switch to indicate positive flow of air shall be installed at each AHU fan and filter and/or as shown on control schematics.

2.13.11DIRECT DIGITAL CONTROL (DDC) SYSTEM

General

The Microprocessor based control system (MBCS) shall comprise of various independent, stand- alone digital controllers (SDC's) as specified to provide local access and control functions.

MICRO-PROCESSOR BASED CONTROL SYSTEM (MBCS) PERFORMANCE REQUIREMENTS. Specifications described in this section are general guidelines to help the bidder understand the intent of the specifications. Deviations from these specifications will be allowed provided the intent of the specifications is fulfilled. However each deviation from these specification must be high-lighted at the time of the bid, and presented in full detail with complete write-up at the time of submittal.

Control wires of any kind will NOT be allowed across floors and between AHU rooms. Cross wiring between floors will only be allowed in the case where a single air handling unit has zones on different floors, or where an AHU has been installed above false ceiling, outside AHU Room or at floor other than area served.

The SDC/SDM should be field programmable. The SDC's/SDM's with factory programmable capability only will not be allowed.

Any control/sensing devices in public areas, or in areas where un-authorized personnel have access to it shall have no or hidden set-points and/or over-riding relays. In case of no set-points/overriding relays, the SDC/SDM should be field programmable for the desired intent.

A comprehensive write-up detailing all components, sequence of operations and schematic drawings, for this project shall be presented at the time of submittal.

Minimum Hardware Performance Requirements

Stand-alone Digital Controllers Modules (SDC's/SDM's)

a)Description

Stand-alone Digital Controllers/Modules shall be 16-bit microcomputer based, providing a multi- tasking operating system for control functions.

SDC's/SDM's shall provide true floating point arithmetic calculations. To accommodate accumulation of large totalized values.

b) Application Program Protection

All programming defining the functions to be performed by the SDC/SDM, including but not limited to application programs and point database, shall be protected from loss due to power failure for a minimum of 12 months. Systems providing non-volatile memory for these functions are preferred.

Systems not providing non-volatile memory shall provide Battery backup sufficient to provide protection for the specified period.

2.13.12Automatic Temperature Control

The SDC's/SDM's shall interface to additional panels of equipment as required to provide the performance specified for Control Panels.

2.13.13Control Panel

Each control panel shall be a fully electronic analog control or digital control system, providing all control functions for the equipment specified to be controlled from that panel. Control functions to be performed by control panels are as described in this specification in the point charts, and other relevant sections of these specifications.

It is the intent of this specification to provide the Employer with the ability to read out temperatures and other values, and to adjust specific items from localized control panel. In order to provide this Room capability, control panels are specified to be placed in specific locations.

Every control panel shall provide readouts for the temperatures, or other information, specified. Every control panel shall provide adjustments for the set points, parameters, and other adjustment functions specified.

At the least one control panel will be provided in each Air Handling Room. Control panels for ceiling-hung AHUs shall be installed in vicinity of AHU room.

2.13.14Read Out of Items

Items specified for read out may be read through plug-in portable operators terminals which are provided as part of MBCS. At least 2 operator terminals shall be provided. Read out of sensed variables used in control sequences shall be from the same sensors used for control. As an alternative, provide either a duplicate sensor for the read out, or provide a transducer for each sensed signal and a signal compatible with the controller.

Label shall be part of the digital display of the value.

2.13.15Adjustments

Every control panel shall provide adjustments for the functions specified. In general, adjustments shall be provided for all set points used by controllers within each control panel. In addition, adjustments shall be provided for throttling ranges, mixed air damper minimum positions, or other items as specified/required Adjustments may be made through plug in portable operators device.

2.13.16 Sensing and Control Outputs Requirements

Sensing

All sensing inputs shall be provided via industry standard signals. Temperature, humidity, differential pressure signals, and all other signal inputs shall be one of the following types:

0-20 mA

4-20 mA

0-5 VDC

0-12 VDC

Resistance Signals

On/Off Dry contact closure.

All signal inputs shall be compatible with the controllers used, and with the requirements for readout of variables as specified.

Control Outputs

(a)On/Off Outputs

Control panel shall internally provide test points for the circuit driving the equipment contactor, for the purpose of troubleshooting whether the 220 VAC circuit to the contactor is active. All such relays or digital output modules shall provide a pilot light or LED display of this same status.

(b) Modulating Outputs

Modulating outputs shall be industry standard 0-5 VDC, or 0-12 VDC. Milli amp outputs of 0-20 mA or 4-20 mA are also acceptable. Drive open/Drive closed type modulating outputs are acceptable provided that they also comply with the following requirements.

All modulating outputs shall provide within the control panel, a metric gauge, or display indication of the commanded position signal to the actuating device. This meter, gauge, or display must provide either a 0-100 percent position indication, or readout directly in the engineering units of the signal being used Drive open/ drive closed type controllers shall include sufficient components and control algorithms to comply with this requirements.

2.13.17 Fire Stats

The air handling unit discharge air sensor shall act as fire-stat. It will monitor the discharge air temperature, and upon its higher then user specified limits the respective AHU shall be bought to fail safe condition.

2.13.18 Controlled Devices

The valves for air handling units would be three-way/two-way as shown on control schematics, proportional type. The control valves for FCUs would be 3-way two position type. All valves shall be capable of handling the system design pressure and design temperature. The valve will incorporate a factory assembled actuator, capable of running at 220/50/1. All valves 2" and smaller size will have threaded connections, larger size valves will have standard flange connections.

The damper motors shall be designed with a safety factor of 1.5. The damper motors shall be suitable for mounting directly on the damper linkage.

All controlled devices will fail to close position. In case of 3-way valves, they will close to by-pass mode.

All valves shall close bubble tight against the operating head of the system. All valves shall be sized for maximum pressure drop of 40 KPa unless specified otherwise hereinafter. All straight through water valves shall have equal percentage characteristics plugs. All valves which are used in sequence with another, and which are 65 mm and larger, shall be provided with positive positioner. Valve operators shall be of the heavy duty type, featuring a reversible motor, gear train and necessary relays.

2.13.19 Standard Software Function Libraries

All SDC's/SDM's shall have as a standard feature of their system software, complete libraries of control algorithms for DDC, Energy Management, and Facilities Management functions. These resident libraries of algorithms shall be drawn from for the creation of the application programming of each individual SDC/SDM.

2.13.20 Application Software Documentation

Contractor shall provide a blueprint documentation of the software application program for each SDC/SDM. Documentation provided shall include block software flow-chart showing the interconnection between each of the control algorithms and sequences. For systems utilizing program listings. A program listing shall be printed onto the same blueprint, along with the program flow-chart, and description of the sequence of operation. This blueprint shall be stored and maintained in each SDC/SDM panel. System acceptance shall not be completed until this documentation is provided and located in each panel.

2.13.21Energy Management Control

The individual SDC's/SDM's shall perform Time of Day, Daily, Weekly, Calendar, Holiday Scheduling, Optimum start/stop, Enthalpy optimization, and all control optimization strategies, such as Supply Air Reset, and Soft Start Ramp up, for their connected systems of equipment.

2.13.12 System Support Inventory

Provide for purposes of system support, a complete set of Input/Output circuit boards sufficient to replace any failed input output point card in any configuration of control panel.

Also provide:

Temperature and Humidity sensing Two of each kind.

Valve actuators and motors

One of each kind.

Pressure sensing devices.

One of each kind.

Smoke detector, Fire stat.

One of each kind.

These shall be kept on-site, and shall be available for immediately recovering from the loss of point processing capability in any control panel.

2.13.13 Distributed Access

It is the intent of this specification to provide the Employer with MBCS information at distributed locations throughout the facility.

Distributed access

SDC's/SDM's shall include at least 2 plugs-in operator devices with full alphanumeric display and a keypad for password controlled access to various levels of operational capability, from simple information access, to full programmability of SDC/SDM functions.

2.13.14 Sequence of Operation

Before preparing technical submittal for submission to the Engineer for approval, the control manufacturer's qualified representative should hold detailed discussions with the Engineer, along with a qualified representative of the Contractor.

After the general consensus on intended functions of Control system, the Control manufacturer's representative shall prepare a formal sequence of operation for submission to Engineer along with technical submittal, to the Engineer, through the Contractor. Sequence of Operation for both winter and summer modes shall be prepared describing power interlocks, adjustments, fire detection and smoke control, S.D.C. failure operation on emergency Set and operating sequences for:

Pumps

Chillers

Cooling Towers

Cooling Towers

The constant condenser water temperature shall be maintained at pre-set level by sensing condenser water temperature and start/stop of cooling tower fans.

2.13.15 Indication

Following equipment (whichever is applicable) shall have the indication at the local controller, located next to equipment;

EQUIPMENT TYPE INDICATION LOCATION

Smoke detector DI SMOKE/NO SMOKE Local SDC

Room Relative Humidity AI DIGITAL %RH Local SDC

Room/zone Air Temp. AI DIGITAL F Local SDC

Supply Air discharge Temp. AI DIGITAL F Local SDC

Air Filter P.D. DI DIRTY/CLEAN Local SDC

Coil/valve AO 0-100% OPEN Local SDC

Supply Air Fan DO ON/OFF Local SDC

Supply Air Fan P.D. DI NO-PRESS/NRML Local SDC

Mixed Air temp.(OA-RA) AI DIGITAL F Local SDC

Chilled/Hot water temp. (IN-OUT)AI DIGITAL F Local SDC

Re-Heat CoilDOON/OFF Local SDC

Room Press. TransmitterAIHi-PRESS/NORMAL Local SDC

Humidifier DO ON/OFF Local SDC

Fire StatsDIFIRE/NO FIRE Local SDC

Variable Frequency DrivesAO 0-100% ADJUSTMENT Local SDC

Water Flow SwitchDIFLOW/NO FLOW Local SDC

Water Pressure TransmitterAIDIGITAL Psi/KpaLocal SDC

Motorized Dampers actuatorAO0-100% ADJUSTMENT Local SDC

2.13.16 DDC POINT SUMMARY SHEET

AIDIAODO

=====================

Cooling Tower & CPR # AOut Side Temperature01---

Out Side RH01---

Chilled/Hot Water Temp. (IN-OUT) at Header02---

Chilled Water Out (Chiller 1)01---

Condenser Water Out (Chiller 1)01---

Condenser Water Temp. (IN-OUT) at Header02---

CT Fan Failure -01--

CT Fan Start/Stop---01Chiller Start/stop

- - - 01Chiller Status

- 01 - -

Condenser Water Pumps Status

- 02 - -

Condenser Water Pumps Start/Stop

- - - 02Water Flow Switches (Chiller)

02 - - -

Cooling Tower & CPR # B

Out Side Temperature01---

Out Side RH01---

Chilled/Hot Water Temp. (IN-OUT) at Header02---

Chilled Water Out (Chiller 2)01---

Condenser Water Out (Chiller 2)01---

Condenser Water Temp. (IN-OUT) at Header02---

Chiller Start/stop

- - - 01Chiller Status

- 01 - -

Condensate Return Pumps Status

- 02 - -

Condensate Return Pumps Start/Stop

- - - 02Water Flow Switches (Chiller)

02 - - -

Motorized Valves CPR A & B

Motorized V/V for Steam (65 mm)--02-

Motorized V/V for Condenser Water (200 mm)--04-

Motorized V/V for Chilled Water (200 mm)--01-

Motorized V/V for Chilled Water (150 mm)--03-

Notes: The HVAC Contractor must discuss control scheme with Consultant/Site Engineer before ordering Controls. Motorized control of water/steam lines shall be desired to run either Chiller (i.e. Steam or Electrical) in Plant Room A & B. All DDC panels must be linked to existing BMS system.2.13.17APPROVED MAKES:

i) Regin

ii) Schneider

iii) Honeywell

iv) Jhonsonv) DeltaThe approved country of origin are USA/Europe.

2.14INSTRUMENTATION2.14.1Furnish and install, in each respective machine room or fan room, the following indicating pipe insertion type thermometers with long stems having scales.2.14.2Compound pressure gauges, at least 4 inch diameter, with Bourdon tube type element and internal, with individual bearings to give best accuracy under fluctuating pressure and vibrations shall be provided at suction and discharge of all condenser pumps.

2.14.3The approved manufacturers for instruments shall be Dawyer/Weiss/Weskler/Tererice from USA/Europe.

2.14.4The Tenderer to give complete details of all the instruments offered by him.

2.15PAINTING2.15.1The Contractor shall paint all plants, equipment, ducting, piping , hangers, bracing and other surfaces exposed to air as specified and he shall also be responsible for all finish painting. The minimum number of coats are specified hereinunder but sufficient coats shall be given to achieve desired finish.

2.15.2Material for painting shall be high grade products of well known manufacturer, and when approved, shall be delivered on the site in original unbroken packages, bearing the makers name and brand. Paints of approved color only shall be used for each application.

2.15.3All surfaces shall be clean, dry and free from dust at the time any coating is applied.

2.15.4Interior painting shall not be done when temperature is below 30 deg. F. Enamel shall not be applied when temperature is; below 70 deg. F. Exterior painting shall not be done in frosty, foggy or damp weather, or when the temperature is below 50 deg. F.

2.15.5All plants, equipments, pumps and motors; shall be provided with three coats of enamel paint in the factory and shall; be carefully cleaned and oiled after installation. In case the original paint has been damaged, fresh coats of enamel paint to match the original shall be given.

2.15.6All steel pipe work, duct bracing angles or other steel equipment specified to be insulated, shall be thoroughly wire-brushed and have one coat of black asphaltum paint before insulation is applied. Boiler breaching and kitchen range hood ducts shall be painted with heat resistant paint.

2.15.7All pipe and duct hangers and duct; angle bracing, which are located in concealed spaces, shall be given a heavy coat of aluminum paint before being concealed.

2.15.8The interior of all duct and outlet boxer at the back of air grilles, registers and diffusers shall be painted with two coats of dull black paint.

2.15.9All black steel ducting, piping and other equipment required to be insulated, shall be thoroughly wire-brushed and applied with one coat of black asphaltum paint before insulation is fixed.

2.15.10The interior of masonry built up fresh air and fan chambers shall be applied two coats of odorless non-scaling paint.

2.15.11All 8 oz. weight canvas jacketed insulated ducting and piping, in plant rooms or visible in the occupied areas, shall be given one coat of polyvinyl 1 acetate with water repellent emulsion and finished with two coats or synthetic enamel paint.

2.15.12Paint shall be applied as per manufacturers printed application directions. Paint color scheme shall be specified at; the time of painting or earlier.

2.15.13The ducting and piping shall be painted according to the color code based on American standard Scheme for identification of piping systems., and used for finish painting. All color codes an scheme shall be approved by the Consultants.

2.15.14The Contractor shall stencil, near each valve on the pipe, the name of the fluid. Also an arrow should be painted next to the legend, indicating the direction of flow in pipe.

2.15.15The Contractor shall further provide manufacturers application directions, performance guarantee and literatures.

2.16CHARTS AND TAGS2.16.1The Contractor shall supply tracings on linen base and four copies each of charts or diagrams showing outline plants of the structure and describing essential features of all the components of; the installed system, for the purpose of identifying the location of all control points, valves etc. for easy operation, maintenance and servicing.

2.16.2The Contractor shall provide identifying crass tags for all valves, controls, etc., with numbers corresponding to those given in the charts or diagrams specified above. The 20 g. brass tags shall be atleast 1-1/4 dia, the numbering shall be stamped, and tags fastened to the controls and valves with brass chains and hooks.

2.16.3The Contractor shall supply tracings on linen base and four copies each of charts indicating schedule and daily start-up and shut down, emergency shut down, schedule of servicing and maintenance, lubrication points and schedule, and chart listing equipment model and serial Nos. conditions of operation, normal settings of automatic and safety controls, data of accessories, and motors manufacturers name and address, and reference No. of technical and spare parts calalogues supplied to the Employer. The Engineer may accept reproducible sepia transparencies instead of linen base tracings.

2.16.4One set of charts and diagrams shall be mounted in glass frame and permanently fixed according to the Engineers direction.

2.16.5The Contractor shall submit to the Engineer for approval the list of charts, diagrams, etc., which he proposed to supply.

2.17CLEANING AND TESTING2.17.1The Contractor shall, during construction, properly cap pipes to prevent the entrance of dirt, etc. Each ducting and piping circuit shall be blown through, after completion, for as long a time as necessary to thoroughly clean that circuit.

2.17.2Not used.2.17.3All water piping shall be tested with a hydraulic pressure of 1-1/2 times the operating pressure, but not less than 150 psig or at a pressure approved by the Engineer, for sufficient time to detect leaks and defects. All leaks and defects shall be made good in a proper workmanlike approved manner. If necessary piping shall be taken down and re-erected, and any make-shift or temporary repair of leaks will not be permitted.

2.17.4The Contractor shall test all electric motors, electric wiring and earning earthing and furnish test records to the Engineer.

2.17.5After the entire installation has been completed, the Contractor shall commission the equipment, making all necessary adjustments in the equipment, plants, balancing valves, etc., as called for and submit reports of performance tests as specified elsewhere in this specification.

2.18COMMISSIONING AND PERFORMANCE TESTS2.18.1The air-conditioning system described in this specification and shown on the drawings shall be commissioned. A program for the commissioning, and any specified tests, shall be prepared and this shall be incorporated in the Contract program following approval by the Engineer.

2.18.2Commissioning shall mean, the advancement of all the building services system, from the state of static completion to full working order, adjusted to the design requirements which are given.

2.18.3The cost of providing all instruments and associated equipment whether of a temporary and/or permanent nature, attendance of any specialists, and for the provision of test points required for; the commissioning; and testing, shall be included in the tender. A recent calibration certificate for each instrument shall be available for inspection.

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